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| 1 | /* | |
| 2 | * Copyright (c) 2000-2005, University of Salford | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions are met: | |
| 7 | * | |
| 8 | * Redistributions of source code must retain the above copyright notice, this | |
| 9 | * list of conditions and the following disclaimer. | |
| 10 | * | |
| 11 | * Redistributions in binary form must reproduce the above copyright notice, | |
| 12 | * this list of conditions and the following disclaimer in the documentation | |
| 13 | * and/or other materials provided with the distribution. | |
| 14 | * | |
| 15 | * Neither the name of the University of Salford nor the names of its | |
| 16 | * contributors may be used to endorse or promote products derived from this | |
| 17 | * software without specific prior written permission. | |
| 18 | * | |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 29 | * POSSIBILITY OF SUCH DAMAGE. | |
| 30 | */ | |
| 31 | ||
| 32 | package issrg.pba.rbac.xmlpolicy.ifstatement; | |
| 33 | ||
| 34 | /** | |
| 35 | * This is the class that represents a Constant node and evaluates the contant | |
| 36 | * specified | |
| 37 | * in the policy XML. | |
| 38 | * | |
| 39 | * <p>If the policy contains the constant of type for which there is no | |
| 40 | * constructor provided | |
| 41 | * by the AEF (not registered with the Types), an EvaluationException will | |
| 42 | * occur at construction-time. | |
| 43 | * | |
| 44 | * @author A.Otenko | |
| 45 | */ | |
| 46 | ||
| 47 | public class ConstantNode extends TermNode { | |
| 48 | /** | |
| 49 | * This is the name of the node that represents the Constant - a static value specified in | |
| 50 | * the policy. | |
| 51 | */ | |
| 52 | public final static String CONSTANT_NODE = "Constant"; | |
| 53 | ||
| 54 | /** | |
| 55 | * This method should be called to register the node with the XML Parser | |
| 56 | */ | |
| 57 | 21 |
 public static void register(){ |
| 58 | 21 | try{ |
| 59 | 21 | issrg.pba.rbac.xmlpolicy.XMLPolicyParser.registerXMLNode(CONSTANT_NODE, ConstantNode.class); |
| 60 | }catch (NoSuchMethodException nsme){ | |
| 61 | 0 | nsme.printStackTrace(); |
| 62 | } | |
| 63 | } | |
| 64 | ||
| 65 | protected String type; | |
| 66 | protected Object value; | |
| 67 | ||
| 68 | 0 |
protected ConstantNode() {} |
| 69 | ||
| 70 | /** | |
| 71 | * This constructor builds an ConstantNode, given a XMLPolicyParser and the | |
| 72 | * set of attributes of this XML element. It expects that a | |
| 73 | * issrg.pba.rbac.xmlpolicy.XMLTags.TYPE_ATTRIBUTE and | |
| 74 | * issrg.pba.rbac.xmlpolicy.XMLTags.VALUE_ATTRIBUTE ("Type" and "Value") are | |
| 75 | * present in this XML element. The value is converted from string into a | |
| 76 | * Java object using the Types.construct() method, so the type of the value | |
| 77 | * must be registered there. | |
| 78 | * | |
| 79 | * @param p - the XMLPolicyParser that builds this ConstantNode | |
| 80 | * @param attr - the attributes of this XML element | |
| 81 | * | |
| 82 | * @throws EvaluationException, if the value could not be decoded using | |
| 83 | * available types | |
| 84 | * @see Types#construct | |
| 85 | */ | |
| 86 | 89 |
public ConstantNode(issrg.pba.rbac.xmlpolicy.XMLPolicyParser p, org.xml.sax.Attributes attr) throws EvaluationException, issrg.pba.rbac.PolicyParsingException{ |
| 87 | 89 | super(CONSTANT_NODE, attr, -1, 0); |
| 88 | ||
| 89 | 89 | type=((String)getAttributes().get(issrg.pba.rbac.xmlpolicy.XMLTags.TYPE_ATTRIBUTE)).intern(); |
| 90 | 0 | if (type==null) throw new issrg.pba.rbac.PolicyParsingException(issrg.pba.rbac.xmlpolicy.XMLTags.TYPE_ATTRIBUTE+" attribute was expected in "+CONSTANT_NODE); |
| 91 | 89 | value = getAttributes().get(issrg.pba.rbac.xmlpolicy.XMLTags.VALUE_ATTRIBUTE); |
| 92 | 0 | if (value==null) throw new issrg.pba.rbac.PolicyParsingException(issrg.pba.rbac.xmlpolicy.XMLTags.VALUE_ATTRIBUTE+" attribute was expected in "+CONSTANT_NODE); |
| 93 | 89 | value = Types.construct(type, (String)value); |
| 94 | } | |
| 95 | ||
| 96 | /** | |
| 97 | * This method returns the Type of the constant as determined at construction | |
| 98 | * time. | |
| 99 | */ | |
| 100 | 211 |
public String getType(){ |
| 101 | 211 | return type; |
| 102 | } | |
| 103 | ||
| 104 | /** | |
| 105 | * This method returns the value of the constant evaluated at construction | |
| 106 | * time. It doesn't actually throw EvaluationExceptions, but the clause is | |
| 107 | * kept for subclasses, if there will be any. | |
| 108 | */ | |
| 109 | 122 |
public Object evaluate(Environment env) throws EvaluationException{ |
| 110 | 122 | return value; |
| 111 | } | |
| 112 | } | |
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